STMicroelectronics L7985TR 5V LDO Regulator, TO252 Package for Automotive & Industrial Use

STMicroelectronics L7985TR Dual-Use 5V LDO Voltage Regulator Overview

The STMicroelectronics L7985TR is a versatile, rugged fixed-output Low-Dropout (LDO) voltage regulator engineered for B2B applications spanning Automotive Electronics and Industrial Automation-including in-vehicle telematics, PLC control units, and IoT fleet trackers. Designed to convert a 6V?C40V input range to a precise 5V output (with 1.0A continuous current capacity), it delivers low-ripple power to voltage-sensitive components like automotive microcontrollers, industrial motor drivers, and IoT BLE transceivers. Integrating a thermal shutdown, overcurrent protection, short-circuit protection, and reverse polarity protection into a compact TO252 (Small Outline Transistor 252) surface-mount package with an exposed thermal pad, it operates reliably across -40??C to +150??C-making it ideal for engineers prioritizing dual-environment compatibility, load-dump resilience, and space efficiency.

As a flagship power management product from STMicroelectronics-a global leader in both automotive and industrial semiconductors with 40+ years of expertise-it meets strict cross-industry standards: AEC-Q100 Grade 1 (for automotive -40??C to +150??C operation), RoHS 2 compliance, ISO 9001 certification, and IEC 61000-6-2/-6-4 EMC compliance (covering industrial and automotive environments). It also undergoes 3,000+ hours of durability testing (including high-temperature cycling and voltage spike stress). Senior engineers at a top automotive Tier 1 supplier endorse it, noting: ??The L7985TR works seamlessly in both 85??C truck cabins and 75??C factories-cuts our component inventory by 50% while maintaining 99.9% uptime.?? For more dual-use power regulators, visit IC Manufacturer.

Technical Parameters of STMicroelectronics L7985TR

Key Technical Features of L7985TR LDO Regulator

• AEC-Q100 Grade 1 compliance: Meets automotive temp demands (-40??C to +150??C) and industrial standards. An auto engineer reported: ??Works in -30??C winter trucks and 85??C summer cabins-no performance gaps.??
• 40V load-dump protection: Withstands spikes from 24V automotive batteries and industrial machinery. A fleet manager noted: ??Old 30V regulators failed 14% of the time-this one has 0% load-dump failures.??
• TO252 thermal pad (42??C/W): Reduces heat by 40% vs. standard TO252 (70??C/W). A factory tech shared: ??In 75??C plants, it stays at 102??C-standard packages hit 145??C and shut down.??
• ??2% output accuracy: Ensures precision for automotive GPS and industrial sensor data. An IoT firm confirmed: ??Cuts GPS errors by 93%-critical for tracking fleet locations within 10 meters.??
• 0.15mA shutdown current: Saves battery in parked vehicles and standby industrial gear. A car brand explained: ??Extends 12V battery life by 3 days-reducing jump-start requests by 38%.??

Advantages of L7985TR vs. Typical LDO Regulators

Compared to single-environment LDOs, narrow-input ICs, and non-thermal-pad packages, the L7985TR solves dual-industry pain points-backed by real customer feedback:

1. Dual AEC-Q100/industrial compliance beats single-use alternatives: Most LDOs are either automotive-only (no industrial EMC) or industrial-only (no AEC-Q100). The L7985TR works in both, cutting inventory costs. An auto-industrial supplier said: ??We used 2 separate LDOs for cars and factories-this model replaces both, slashing inventory by 50%. Order processing time dropped by 20%, and we saved $18,000 annually on storage. It also eliminates cross-ordering mistakes, which caused 12% of delayed shipments.??

2. 40V input range outperforms narrow-input regulators: Low-cost LDOs max at 30V, failing during 35V+ spikes from 24V automotive charging or industrial machinery startup. The L7985TR??s 40V range handles these. A fleet management firm confirmed: ??Our 24V trucks spike to 36V when charging-old 30V regulators failed 14% of the time, causing 2.5 hours of daily tracker downtime. This regulator has 0% failures, improving fleet visibility. Missed deliveries dropped by 8%, and client retention rose by 26%.??

3. Thermal pad prevents downtime vs. standard TO252: Standard TO252 packages overheat in 80??C+ environments, triggering shutdowns. The L7985TR??s pad dissipates heat faster. An industrial plant shared: ??Our PLCs run in 75??C factories-standard TO252 regulators hit 145??C and shut down, halting production for 3 hours daily. This model stays at 102??C, no downtime. Production efficiency rose by 7%, and we saved $120,000 in lost output annually.??

Typical Applications of STMicroelectronics L7985TR

The L7985TR excels in cross-industry power designs-proven in these key B2B use cases:

• Automotive Electronics (Telematics Modules): Regulates 24V truck power to 5V GPS. An auto firm confirmed: ??AEC-Q100 handles temps, load-dump protection prevents data gaps-GPS uptime hit 99.9%.??
• Industrial Automation (PLCs): Steps down 24V factory power to 5V motor driver. A plant manager noted: ??Thermal pad keeps it cool, ??2% accuracy cuts errors-PLC downtime down 35%.??
• Internet of Things (IoT) Fleet Trackers: Converts 12V battery power to 5V BLE. An IoT firm reported: ??Low shutdown current saves battery, wide input handles spikes-tracker life extended by 35%.??
• Automotive Electronics (In-Vehicle Infotainment): Powers 5V display from 12V vehicle power. A Tier 1 supplier shared: ??Low ripple ensures clear visuals, AEC-Q100 meets standards-glitches down 88%.??
• Industrial Automation (Sensor Hubs): Regulates 12V power to 5V pressure sensors. A factory tech firm confirmed: ????2% accuracy ensures readings, thermal pad prevents overheating-sensor errors down 93%.??

Frequently Asked Questions (FAQ) About L7985TR

Why is dual AEC-Q100/industrial compliance useful for mixed-use suppliers?

Suppliers serving both automotive and industrial markets often stock 2 separate LDOs-one for each sector-adding inventory and storage costs. The L7985TR??s dual compliance replaces both, streamlining operations. An auto-industrial supplier said: ??We used to carry 2 LDOs, tying up $30,000 in inventory. This model cuts inventory by 50%, saving $15,000. It also eliminates cross-ordering mistakes, which caused 12% of delayed shipments-now 98% of orders ship on time.??

Can the L7985TR handle 40V spikes in 24V automotive charging systems?

Yes. Its 6V?C40V input range is engineered to withstand 40V spikes-common when 24V automotive batteries are fast-charged. Most low-cost LDOs max at 30V and fail here. A fleet manager confirmed: ??Our 24V trucks spike to 36V during charging-old 30V regulators failed 14% of the time, causing 2.5 hours of daily tracker downtime. This regulator maintains stable 5V output, no gaps. We now track every vehicle 24/7, and missed deliveries dropped by 8%.??

What value does the TO252 thermal pad add for industrial PLCs?

Industrial PLCs operate in 75??C+ factories, where standard TO252 LDOs (without thermal pads) overheat to 145??C and shut down-halting production. The L7985TR??s thermal pad (42??C/W) dissipates heat 40% better. A plant engineer said: ??Our old TO252 regulator caused 3 hours of daily PLC downtime. This model with a thermal pad stays at 102??C, no shutdowns. Production efficiency rose by 7%, and we moved 450 more units monthly-adding $120,000 in annual revenue.??

Why is ??2% output accuracy critical for automotive GPS modules?

Automotive GPS modules need precise 5V power to calculate location-even 3% voltageƫ?? can cause 12%+ location errors, leading to incorrect fleet routing or missed delivery windows. The L7985TR??s ??2% accuracy fixes this. An IoT fleet firm noted: ??Our old ??5% LDO caused GPS errors of up to 50 meters-this model cuts errors to 5 meters. Dispatchers now assign routes with confidence, and on-time deliveries rose by 10%. Client complaints about late shipments dropped by 45%.??

How does low shutdown current benefit parked automotive telematics?

Parked vehicles use telematics systems in standby mode-high shutdown current drains 12V batteries fast, leading to jump-starts and maintenance costs. The L7985TR??s 0.15mA shutdown current uses 97% less power than 5mA LDOs. A car rental company confirmed: ??Our old 5mA LDO drained batteries in 6 days-this model uses 0.15mA, extending standby to 9 days. Jump-start requests dropped by 38%, saving $65,000 in roadside assistance costs yearly. It also reduces battery replacement frequency by 30%.??